| Information Requests Monitoring System
Request ID: 143
Request From: Steve Toth
Date Requested: Jan 05, 2006
Request: Note the following request for information on dimethoate use on 24 crops (with less than 1% of crop treated). Please pass along this request to the experts in your states/territories and submit any responses to the Information Requests Monitoring System by January 19, 2006.
Thanks for your help!
Steve Toth
----------------------------------------------
EPA is in the early stages of preparing risk mitigation decisions for
dimethoate. Because of the August 2006 FQPA deadline to reassess all
tolerances, dimethoate is scheduled by EPA for final decisions within the
next several months. Malathion is on a similar track.
I am contacting you instead of my OPMP colleague, Phil Poli, who is on
extended leave. EPA has requested USDA assistance in obtaining benefits
information for 24 crops with less than 1% crop treatment with dimethoate.
EPA will be initiating outreach directly for other commodities of interest.
Per EPA, the crops with less than 1% crop treated are: alfalfa, asparagus,
carrots, corn, cotton, grapefruit, onions, oranges, spring wheat, peanuts,
pears, plums and prunes, pumpkins, sorghum, squash, strawberries, sugar
beets, sunflowers, sweet corn, tobacco, wheat, soybeans, and safflower.
Please respond in three weeks to the following EPA questions and add your
contact information as well should follow-up be required as EPA prepares
for risk mitigation decisions. By answering as many questions as possible,
EPA will be able to further refine the risk assessment for dimethoate by
improving the ecological risk and drinking water numbers, address REI
issues and obtain needed benefits information.
The answers to some questions may be contained in existing crop profiles
and Pest Management Strategic Plans (PMSPs) but EPA has not had opportunity
to collate the information; focusing instead on the crops with larger
percent crop treatment. The short time frame precludes OPMP from
collating the information as well so we are relying on experts in the
field.
Per EPA to OPMP, "Please consider the best way for us to work together to
get at this information quickly, since our time frame is short. If a use
is to be maintained, we will need some documentation to support that use in
light of existing risks. Specifically, it would be helpful if growers
could provide answers to as many of the following questions as possible."
(1) In what region (state/county, etc.) of the US does the use occur?
(2) What are the pests that they feel are critical for the low usage of
dimethoate use?
(3) What are the details of their typical usage pattern (e.g., number of
applications per season, use rate per application, acres treated, time of
application in the season?)
(4) What worker activities typically occur when they need to apply
dimethoate?
(5) What alternatives, if any, do they feel they would have to use to
replace dimethoate?
Thank you again for your assistance. Please forward this request to others
as appropriate. I will keep you apprised and will be sending out a similar
request today for malathion.
Please do not hesitate to contact me if you have any questions or comments.
Teung F. Chin, Ph.D.
Biological Scientist
Office of Pest Management Policy
Agricultural Research Service
United States Department of Agriculture
USDA Animal & Plant Health Inspection Service
4700 River Road, Unit 149 (Room 3D-06.8)
Riverdale, MD 20737-1237
Phone (301) 734-8943
Fax (301) 734-5992
Teung.F.Chin@usda.gov
http://www.ars.usda.gov/opmp
Responses
Responder: Mark Matocha
State: TX
Date Requested: Jan 12, 2006
Response: Notes on critical dimetholate uses in Texas crops
Summarized January 11, 2006
Provided by TCE, Texas A&M System
Grain sorghum: Particularly important for several pests
Yellow sugarcane aphid (YSA), dimetholate is important due to the widespread range of this pest and somewhat limited alternatives for control when out breaks occur.
Rice stink bug (RSB) - label states “do no use after heading” .
But use within that time frame is important in some years when out breaks occur.
Do not observe any crop damage from pesticide but RSB losses can be severe.
Spider mite, Banks grass mite, and occasional green bug control - in sorghum in High Plains region (in irrigated and dry land production from Lubbock, north to OK panhandle region).
Particularly important for Banks grass mite control - as a stand alone treatment.
Key for good control is assuring good spray coverage on the crop foliage.
Use in Coastal Bend area of Texas (Corpus Christi region) - dimethoate use has been limited in past six years but the product is important when out breaks occur. This occasional use probably accounts for this crop being on the “less than 1%” list at EPA.
Corn. Spider mite and Banks grass mite control
Banks grass mite control - dimetholate alone gives weak to moderate control but is synergistic when applied with Warrior or Capture, giving good 7 to 14 day control (depending on stage of crop growth and environmental conditions). Difference between control in corn and sorghum is due to structure (less plant coverage due to wider foliage).
Resource People
High Plains region: Mr. Greg Croholm, IPM Extension Agent
POB 680
Plainview, Texas 79073-0680
806-291-5274
Coastal Bend Region: Dr. Roy Parker, Area Extension Entomologist
Texas A&M Center at Corpus Christi
512-265-9201
Responder: Scott Stewart
State: TN
Date Requested: Jan 14, 2006
Response: Dimethoate, although used on limited acreas in Tennessee cotton fields, is a valuable product for cotton producers in parts of the MidSouth and Southeast. It provides inexpensive and effective control of plant bugs and spider mites in some circumstances.
The need for short-duration, late-season control of mites is sometimes needed throughout the region. Alternative for spider mite control are considerably more expensive and include Zephry, Oberson, Capture, Kelthane, Denim, Comite and Acramite. Other than Capture, dimethoate is the only miticide that also provides reasonable control of plant bugs and stink bugs (common pests of cotton). In this way, dimethoate has a unique niche.
Although spider mites are a rare problem in soybean, there are essentially no effective alternatives to dimethoate for mite control in this crop.
When used, dimethoate is rarely applied more than twice at a maximum application rate of 0.25 Lb AI/Acre. At the time of application, normally mid to late season, scouting is the only activity that typically occur in fields.
Dr. Scott Stewart
Associate Professor
IPM Specialist
University of Tennessee
(731) 425-4709
sdstewart@utk.edu
Responder: Mark Mossler
State: NC
Date Requested: Jan 19, 2006
Response: This is a fairly easy question for Florida. No dimethoate is used for these listed crops. It is used for some other ag crops and ornamentals. Will try to confirm this same trend in PR and the VI.
Mark Mossler
Responder: Steve Toth
State: NC
Date Requested: Jan 19, 2006
Response: Very little use of dimethoate on cotton in North Carolina. We have this product listed for thrips control in the North Carolina Agricultural Chemical Manual, but its use by cotton producers is almost non existent (say ~1%). Dimethoate is also labeled for plant bugs on cotton, but we do not recommend it in North Carolina.
Jack Bacheler
Extension Entomologist - Cotton
North Carolina State University
Responder: Holly Gatton
State: VA
Date Requested: Jan 19, 2006
Response: I’m attaching the file that Mike and I put together on dimethoate use in Virginia.
Holly A. Gatton
Project Manager
Virginia Tech Pesticide Programs
Department of Entomology
34 Agnew Hall, MC 0409
Blackburg, VA 24061
Email: hgatton@vt.edu
Phone: 540-231-2086
Fax: 540-231-3057
Attachment included in response
[Download]
Responder: Charles Luper
State: OK
Date Requested: Jan 19, 2006
Response: For Oklahoma Dimethoate is not very important to Alfalfa and peanuts. It is used on less than 5% of the aceaage and alternatives exist according to Dr. Phil Mulder.
For Oklahoma Dimethoate biggest importance would be to the wheat acreage. Dimethoate is a very imporant tool for aphid control. It is a very cost effecient tool versus alternatives for aphid control on wheat.
Responder: Darrell Hensley
State: KY
Date Requested: Jan 20, 2006
Response: KENTUCKY GRAIN CROPS
Douglas W. Johnson, Extension Entomologist
UK-IPM Coordinator
UK-REC
1205 Hopkinsville St.
Princeton, KY 42445-0469
Voice: 270/365-7541 x 214
Campus: 7-9503 x214
FAX: 270/365-2667
E-Mail: doug.johnson@uky.edu
This response concerns the following grain crops: Sorghum (grain), wheat(soft red winter), soybeans (full season and double-crop).
General: Dimethoate is rarely used on any grain crop in Kentucky. It's most important use would be against spider mites outbreaks on soybean. Little effect will occur from removing sorghum or wheat (soft red winter) from the label. However, removing the product from soybean could have a very
important result.
(1) In what region (state/county, etc.) of the US does the use occur?
KENTUCKY, PRIMARILY WESTERN 1/3 OF THE STATE.
(2) What are the pests that they feel are critical for the low usage of dimethoate use?
TWO SPOTTED SPIDER MITES ON SOYBEAN
(3) What are the details of their typical usage pattern (e.g., number of applications per season, use rate per application, acres treated, time of application in the season?)
THIS IS A SPORADIC BUT IMPORTANT PROBLEM. THE OUTBREAKS ARE USUALLY A RESULT OF DROUGHT CONDITIONS. IF THE OUTBREAK OCCURS TREATMENT WILL BE AT THE FULL LABEL RATE AND 1-2 APPLICATIONS PER AFFECTED AREA. BECAUSE OF KY's GENERAL
WEATHER PATTERNS OUTBREAKS WILL USUALLY OCCUR IN THE AUGUST - SEPTEMBER TIME FRAME. HOWEVER, BECAUSE WE HAVE BOTH FULL SEASON AND DOUBLE CROP BEANS IT COULD OCCUR ALMOST ANY TIME OF THE GROWING SEASON. ACRES TREATED WILL DEPEND UPON HOW WIDE SPREAD THE DROUGHT THUS OUTBREAK BECOMES.
(4) What worker activities typically occur when they need to apply dimethoate?
VERY FEW WORKER ACTIVATES AFTER SPRAYING. SCOUTING WILL OCCUR TO DETERRING IF / WHEN / WHERE TREATMENTS ARE NEEDED. GRAIN PRODUCTION IN KY IS A HIGHLY MECHANIZED PRODUCTION SYSTEM.
(5) What alternatives, if any, do they feel they would have to use to replace dimethoate?
AT THIS POINT ONLY LORSBAN (CHLORPYRIFOS) IS LABELED FOR THIS PEST. BECAUSE OF THE SPORADIC NATURE OF THE PROBLEM, AND DIFFICULTY IN OBTAINING ADEQUATE CONTROL, I THINK IT UNLIKELY THAT COMPANIES WILL SEEK TO EXPAND EXISTING LABELS TO INCLUDE SPIDER MITES. THUS REMOVE ONE OF THE CURRENTLY LABELED
COMPOUNDS WILL SIMPLY REDUCE THE NUMBER OF TOOLS AVAILABLE AND MAY INCREASE CHANCES OF RESISTANCE TO THE REAMING TOOL.
--------------------------
Darrell Hensley
University of Tennessee
2431 Joe Johnson Drive, 205 PSB
Knoxville, TN 37996-4560
Phone (865) 974-7958
Fax (865) 974-8868
email: dhensley@utk.edu
Responder: Frank Hale
State: TN
Date Requested: Jan 24, 2006
Not Important/Relevant to my state(s)
Response: Dimethoate is not in our Extension recommendations for the listed crops. The loss of its use on these crops would not significantly harm our growers. Other alternative insecticides are available for the listed crops.
Responder: Frank Hale
State: TN
Date Requested: Jan 24, 2006
Response: I wanted to amend my previous comments to state that the listed crops to which I was referring were the fruit and vegetable crops and tobacco with which I work. On those crops, dimethoate is not an important insecticide in Tennessee. I am not speaking for the other listed crops.
Responder: Charles Luper
State: OK
Date Requested: Jan 26, 2006
Response: Dr. Tom Royers reponse to the Diemthoate needs is included in the attached file.
Attachment included in response
[Download]
Return to Other Requests
|
